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authorValentin Rothberg <rothberg@redhat.com>2020-04-22 11:43:50 +0200
committerValentin Rothberg <rothberg@redhat.com>2020-04-27 12:00:35 +0200
commit7ee0f7e14c3105be1ef9c8aee00a09b479303677 (patch)
tree2f55831368cc376a18876a6b201d7be91baaa299 /cmd
parentefafd99e6d9e2555c2a167bc17d07629503a2c34 (diff)
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implement pod stats
Implement pod stats for the local and remote client. Both code paths end up in infra/abi to allow for code share. Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
Diffstat (limited to 'cmd')
-rw-r--r--cmd/podman/pods/stats.go189
1 files changed, 189 insertions, 0 deletions
diff --git a/cmd/podman/pods/stats.go b/cmd/podman/pods/stats.go
new file mode 100644
index 000000000..7c3597d9a
--- /dev/null
+++ b/cmd/podman/pods/stats.go
@@ -0,0 +1,189 @@
+package pods
+
+import (
+ "context"
+ "fmt"
+ "os"
+ "reflect"
+ "strings"
+ "text/tabwriter"
+ "text/template"
+ "time"
+
+ "github.com/buger/goterm"
+ "github.com/containers/buildah/pkg/formats"
+ "github.com/containers/libpod/cmd/podman/registry"
+ "github.com/containers/libpod/pkg/domain/entities"
+ "github.com/containers/libpod/pkg/util/camelcase"
+ "github.com/spf13/cobra"
+)
+
+type podStatsOptionsWrapper struct {
+ entities.PodStatsOptions
+
+ // Format - pretty-print to JSON or a go template.
+ Format string
+ // NoReset - do not reset the screen when streaming.
+ NoReset bool
+ // NoStream - do not stream stats but write them once.
+ NoStream bool
+}
+
+var (
+ statsOptions = podStatsOptionsWrapper{}
+ statsDescription = `Display the containers' resource-usage statistics of one or more running pod`
+ // Command: podman pod _pod_
+ statsCmd = &cobra.Command{
+ Use: "stats [flags] [POD...]",
+ Short: "Display resource-usage statistics of pods",
+ Long: statsDescription,
+ RunE: stats,
+ Example: `podman pod stats
+ podman pod stats a69b23034235 named-pod
+ podman pod stats --latest
+ podman pod stats --all`,
+ }
+)
+
+func init() {
+ registry.Commands = append(registry.Commands, registry.CliCommand{
+ Mode: []entities.EngineMode{entities.ABIMode, entities.TunnelMode},
+ Command: statsCmd,
+ Parent: podCmd,
+ })
+
+ flags := statsCmd.Flags()
+ flags.BoolVarP(&statsOptions.All, "all", "a", false, "Provide stats for all pods")
+ flags.StringVar(&statsOptions.Format, "format", "", "Pretty-print container statistics to JSON or using a Go template")
+ flags.BoolVarP(&statsOptions.Latest, "latest", "l", false, "Provide stats on the latest pod Podman is aware of")
+ flags.BoolVar(&statsOptions.NoReset, "no-reset", false, "Disable resetting the screen when streaming")
+ flags.BoolVar(&statsOptions.NoStream, "no-stream", false, "Disable streaming stats and only pull the first result")
+
+ if registry.IsRemote() {
+ _ = flags.MarkHidden("latest")
+ }
+}
+
+func stats(cmd *cobra.Command, args []string) error {
+ // Validate input.
+ if err := entities.ValidatePodStatsOptions(args, &statsOptions.PodStatsOptions); err != nil {
+ return err
+ }
+
+ format := statsOptions.Format
+ doJson := strings.ToLower(format) == formats.JSONString
+ header := getPodStatsHeader(format)
+
+ for {
+ reports, err := registry.ContainerEngine().PodStats(context.Background(), args, statsOptions.PodStatsOptions)
+ if err != nil {
+ return err
+ }
+ // Print the stats in the requested format and configuration.
+ if doJson {
+ if err := printJSONPodStats(reports); err != nil {
+ return err
+ }
+ } else {
+ if !statsOptions.NoReset {
+ goterm.Clear()
+ goterm.MoveCursor(1, 1)
+ goterm.Flush()
+ }
+ if len(format) == 0 {
+ printPodStatsLines(reports)
+ } else if err := printFormattedPodStatsLines(format, reports, header); err != nil {
+ return err
+ }
+ }
+ if statsOptions.NoStream {
+ break
+ }
+ time.Sleep(time.Second)
+ }
+
+ return nil
+}
+
+func printJSONPodStats(stats []*entities.PodStatsReport) error {
+ b, err := json.MarshalIndent(&stats, "", " ")
+ if err != nil {
+ return err
+ }
+ fmt.Fprintf(os.Stdout, "%s\n", string(b))
+ return nil
+}
+
+func printPodStatsLines(stats []*entities.PodStatsReport) {
+ w := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
+ outFormat := "%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\n"
+ fmt.Fprintf(w, outFormat, "POD", "CID", "NAME", "CPU %", "MEM USAGE/ LIMIT", "MEM %", "NET IO", "BLOCK IO", "PIDS")
+ for _, i := range stats {
+ if len(stats) == 0 {
+ fmt.Fprintf(w, outFormat, i.Pod, "--", "--", "--", "--", "--", "--", "--", "--")
+ } else {
+ fmt.Fprintf(w, outFormat, i.Pod, i.CID, i.Name, i.CPU, i.MemUsage, i.Mem, i.NetIO, i.BlockIO, i.PIDS)
+ }
+ }
+ w.Flush()
+}
+
+func printFormattedPodStatsLines(format string, stats []*entities.PodStatsReport, headerNames map[string]string) error {
+ if len(stats) == 0 {
+ return nil
+ }
+
+ // Use a tabwriter to align column format
+ w := tabwriter.NewWriter(os.Stdout, 0, 0, 3, ' ', 0)
+ // Spit out the header if "table" is present in the format
+ if strings.HasPrefix(format, "table") {
+ hformat := strings.Replace(strings.TrimSpace(format[5:]), " ", "\t", -1)
+ format = hformat
+ headerTmpl, err := template.New("header").Parse(hformat)
+ if err != nil {
+ return err
+ }
+ if err := headerTmpl.Execute(w, headerNames); err != nil {
+ return err
+ }
+ fmt.Fprintln(w, "")
+ }
+
+ // Spit out the data rows now
+ dataTmpl, err := template.New("data").Parse(format)
+ if err != nil {
+ return err
+ }
+ for _, s := range stats {
+ if err := dataTmpl.Execute(w, s); err != nil {
+ return err
+ }
+ fmt.Fprintln(w, "")
+ }
+ // Flush the writer
+ return w.Flush()
+
+}
+
+// getPodStatsHeader returns the stats header for the specified options.
+func getPodStatsHeader(format string) map[string]string {
+ headerNames := make(map[string]string)
+ if format == "" {
+ return headerNames
+ }
+ // Make a map of the field names for the headers
+ v := reflect.ValueOf(entities.PodStatsReport{})
+ t := v.Type()
+ for i := 0; i < t.NumField(); i++ {
+ split := camelcase.Split(t.Field(i).Name)
+ value := strings.ToUpper(strings.Join(split, " "))
+ switch value {
+ case "CPU", "MEM":
+ value += " %"
+ case "MEM USAGE":
+ value = "MEM USAGE / LIMIT"
+ }
+ headerNames[t.Field(i).Name] = value
+ }
+ return headerNames
+}